\section{Synopsis}

This module provides utility functions for \htmlref{date}{glos:date} calculations using a specified calendar. The 
interface has been 
designed with use by Earth system models specifically in mind. The use of derived types for date and time \htmlref{time}
{glos:time} interval 
data allows for a wide range of values and precision so that applications from weather forecasting to paleoclimate 
simulation are supported.





